6.2.1 Necessary settings in the modem
If the modem is connected directly to the meter no special settings are needed. The modem’s
standard settings are used. The modem should in this case not be configured to answer automatically
(ATS0=0).
If the modem is connected to a signal converter (RS-485/RS-232) it must be configured to answer
automatically (ATS0=1). See below how to configure the modem using the Hyper Terminal in
Windows.
6.2.2 Commands
HyperTerminal is used on the computer to configure the modem, and a number of commands can be
executed to view and change the settings. The important commands are as follows:
AT = Used as a communication test. The modem should answer “OK”
ATE0 = Disables the text function, no text is sent to the screen.
ATE1 = Enables the echo function, which shows text on the screen.
AT&B0 = Sets the bit rate to automatic mode, adjusts to the other equipment.
AT&B1 = Sets the bit rate to a fixed speed (same as the speed set in HyperTerminal).
ATS0=1 = Sets the modem to automatically answer after 1 ring, the number can be
changed as necessary.
ATS0=0 = Deactivates the automatic answer mode (recommended).
ATI4 = Shows the settings defined in the modem.
AT&W = Saves changes to the modem memory.
ATL1 = Sets the modem´s sound level to level 1. Level 0 (ALT0) turns off the sound
and level 3 (ALT3) sets the sound level to max.
6.2.3 Recommended modem settings
The figure shows the typical settings [ATI4] in a US Robotics modem:
U.S. Robotics 56K FAX EXT Settings...
B1 E1 F1 L0 M1 Q0 V1 X4 Y0
SPEED=57600 PARITY=N WORDLEN=8
DIAL=TONE OFF LINE CID=0
&A3 &B1 &C1 &D2 &H1 &I0 &K1
&M4 &N0 &P0 &R2 &S0 &T5 &U0 &Y1
S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=004
S07=060 S08=002 S09=006 S10=014 S11=072 S12=050 S13=000
S15=000 S16=000 S18=000 S19=000 S21=010 S22=017 S23=019
S25=005 S27=001 S28=008 S29=020 S30=000 S31=128 S32=002
S33=000 S34=000 S35=000 S36=014 S38=000 S39=012 S40=000
S41=004 S42=000
LAST DIALLED #
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